Xau(3X)Xau(3X)NAME
Xau, XauFileName, XauReadAuth, XauLockAuth, XauUnlockAuth,
XauWriteAuth, XauGetAuthByAddr, XauGetBestAuthByAddr - X authority
database routines
SYNOPSIS
#include <X11/Xauth.h> typedef struct xauth {
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
unsigned short name_length;
char *name;
unsigned short data_length;
char *data; } Xauth;
char *XauFileName()
Xauth *XauReadAuth (auth_file)
FILE *auth_file;
int XauWriteAuth (auth_file, auth)
FILE *auth_file;
Xauth *auth;
Xauth *XauGetAuthByAddr (family, address_length, address, num‐
ber_length, number)
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
Xauth *XauGetBestAuthByAddr (family, address_length, address, num‐
ber_length, number, types_length, types, type_lengths)
unsigned short family;
unsigned short address_length;
char *address;
unsigned short number_length;
char *number;
int types_length;
char **types;
int *type_lengths;
int XauLockAuth (file_name, retries, timeout, dead)
char *file_name;
int retries;
int timeout;
long dead;
int XauUnlockAuth (file_name)
char *file_name;
XauDisposeAuth (auth)
Xauth *auth;
DESCRIPTION
XauFileName generates the default authorization file name by first
checking the XAUTHORITY environment variable if set, else it returns
$HOME/.Xauthority. This name is statically allocated and should not be
freed.
XauReadAuth reads the next entry from auth_file. The entry is not
statically allocated and should be freed by calling XauDisposeAuth.
XuWriteAuth writes an authorization entry to auth_file. It returns 1
on success, 0 on failure.
XauGetAuthByAddr searches for an entry which matches the given network
address/display number pair. The entry is not statically allocated and
should be freed by calling XauDisposeAuth.
XauGetBestAuthByAddr is similar to XauGetAuthByAddr, except that a list
of acceptable authentication methods is specified. Xau will choose the
file entry which matches the earliest entry in this list (for example,
the most secure authentication method). The types argument is an array
of strings, one string for each authentication method. types_length
specifies how many elements are in the types array. types_lengths is an
array of integers representing the length of each string.
XauLockAuth does the work necessary to synchronously update an autho‐
rization file. First it makes two file names, one with -c appended to
file_name, the other with -l appended. If the -c file already exists
and is more than dead seconds old, XauLockAuth removes it and the asso‐
ciated -l file. To prevent possible synchronization troubles with NFS,
a dead value of zero forces the files to be removed. XauLockAuth makes
retries attempts to create and link the file names, pausing timeout
seconds between each attempt. XauLockAuth returns a collection of val‐
ues depending on the results: A system error occurred, either a
file_name which is too long, or an unexpected failure from a system
call. errno may prove useful. gretries attempts failed. The lock
succeeded.
XauUnlockAuth undoes the work of XauLockAuth by unlinking both the -c
and -l file names.
XauDisposeAuth frees storage allocated to hold an authorization entry.
SEE ALSOxauth(1X), xdm(1X)AUTHOR
Keith Packard, MIT X Consortium
Xau(3X)
